select a pool based on source IP and then amend headers based on selected pool

Will something like this work for your node selection?

when CLIENT_ACCEPTED {
    if { [IP::addr [IP::client_addr] equals 10.0.0.0/8] } {
        node server2.internal.com
    }
    else {
        node server1.external.com
    }
}

Yes, perhaps there are two options here - one is to have two pools with one server in each OR have a single pool with two servers in it... not sure what would the recommended option be. My thinking was that two pools would be a more universal solution (as then I could add servers to each of the pools) but I do not know how to reference pool name.

The code below does not seem to be working

when CLIENT_ACCEPTED {
    if { [IP::addr [IP::client_addr] equals 10.0.0.0/8] } {
        pool POOL_FOR_EXTERNAL_SERVERS
    }
    else {
        pool POOL_FOR_INTERNAL_SERVERS
    }
}
when HTTP_REQUEST {
    if { [LB::server pool] eq "POOL_FOR_EXTERNAL_SERVERS" } {
        <....handling headers for the external servers..>
    } else {
        <.. handling headers for the internal servers ..>
    }
}

What am I doing wrong here?

the IF statement in HTTP_REQUEST handling does not seem to work...

Where would that log entry appear? System - Logs - Local Traffic? (cannot find where it's saving the log to... nothing is appearing in the external syslog :()

Ignore me - found now! By looks of it the pool name is prefixed by "/Common/". Silly mistake :) I will correct and get back with an update.

Ok, all good now except one thing - the internal server is HTTP only on the server side, and the VS has SSL profiles both on the client side and on the server side. Now when I select the internal pool I get "Page not available" in the browser. I assume this is because LTM is trying to negotiate SSL to the port 80 of the server that allows only HTTP.

How do I correctly disable SSL profile and under what event? Currently I am trying as follows (does not seem to be working):

when CLIENT_ACCEPTED {
    if { [IP::addr [IP::client_addr] equals 192.168.1.0/24] } {
        pool "/Common/POOL_SERVICEDESK_EXT_HTTPS_443"
        log local0. "SERVICEDESK Client accepted, pool [LB::server pool]"
    }
    else {
        pool "/Common/POOL_SERVICEDESK_INT_HTTP_80"
        log local0. "SERVICEDESK Client accepted, pool [LB::server pool]"
         disable SSL here?
        SSL::disable serverside
    }
}

when HTTP_REQUEST {
 if { [LB::server pool] eq "/Common/POOL_FOR_EXTERNAL_SERVERS" }{
        
         Working with headers for External server
        
        log local0. "SERVICEDESK Request Received. Active app - External"
        HTTP::header replace host "server1.external.com" 
        if {[HTTP::uri] equals {/}} {HTTP::uri {/support/home}}
        } else {
        
         Working with headers for Supportworks
        
        log local0. "SERVICEDESK Request Received. Active app - Internal"
        HTTP::header replace host "server2.internal.com"
         or shall I disable it here?
        SSL::disable serverside
 }
}

when HTTP_RESPONSE {
     Rewrite the Location header for redirects
    if { [HTTP::header exists Location] }{ 
        HTTP::header replace Location [string map {"https://server1.external.com" "https://app.internal.com"} [HTTP::header Location]] 
        HTTP::header replace Location [string map {"http://server2.internal.com" "https://app.internal.com"} [HTTP::header Location]]
   }
}